Mysteries of Bird Migration. ... When a birdwatcher times a vacation as perfectly as the birds time their migration, the results can be spectacular. ... weather is threatening, the birds may put down in gigantic flocks that fill habitats with a bustle of busy life – thrilling those birdwatchers lucky enough to intercept such an event. read more
There is no Mystery.Studies & Observations over decades have given enough materiel & causes for bird migration. Each species migrates for its own reasons. The general & main reason being Weather changes and the subsequent food scarcity. The Migration Routes of several species have been mapped using the state of the art technology. read more
One idea is that through many generations the tropical ancestors of these birds dispersed from their tropical breeding sites northward. read more